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https://issues.apache.org/jira/browse/HBASE-22050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lujie updated HBASE-22050:
--------------------------
Affects Version/s: 3.0.0
> NPE happens while RS shutdown, due to atomic violation
> ------------------------------------------------------
>
> Key: HBASE-22050
> URL: https://issues.apache.org/jira/browse/HBASE-22050
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 3.0.0
> Reporter: lujie
> Assignee: lujie
> Priority: Major
>
> while RS shutdown, the RS#abort are called due to
> {code:java}
> handler.AssignRegionHandler: Fatal error occured while opening region
> hbase:meta,,1.1588230740, aborting...
> {code}
> And in abort:
> {code:java}
> 2428.if (rssStub != null && this.serverName != null) {
> 2429 ReportRSFatalErrorRequest.Builder builder =
> 2430. ReportRSFatalErrorRequest.newBuilder();
> 2431. builder.setServer(ProtobufUtil.toServerName(this.serverName));
> 2432 builder.setErrorMessage(msg);
> 2433 rssStub.reportRSFatalError(null, builder.build());
> 2434 }
> {code}
> 2428-2434 are assumed to be atomic, but if it step in the 2429-2433,
> meanwhile RS#run:
> {code:java}
> 1149 // Make sure the proxy is down.
> 1150 if (this.rssStub != null) {
> 1151 this.rssStub = null;
> 1152 }
> {code}
> So the rssStub == null and NPE happens
> {code:java}
> 2019-03-14 04:49:53,016 WARN [RS_CLOSE_META-regionserver/hadoop12:16020-0]
> regionserver.HRegionServer: Unable to report fatal error to master
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.abort(HRegionServer.java:2433)
> at
> org.apache.hadoop.hbase.regionserver.handler.AssignRegionHandler.handleException(AssignRegionHandler.java:154)
> at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:106)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> I think we should avoid the NPE.
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